Decouple dllexport/dllimport from linkage
Representing dllexport/dllimport as distinct linkage types prevents using
these attributes on templates and inline functions.
Instead of introducing further mixed linkage types to include linkonce and
weak ODR, the old import/export linkage types are replaced with a new
separate visibility-like specifier:
define available_externally dllimport void @f() {}
@Var = dllexport global i32 1, align 4
Linkage for dllexported globals and functions is now equal to their linkage
without dllexport. Imported globals and functions must be either
declarations with external linkage, or definitions with
AvailableExternallyLinkage.
llvm-svn: 199218
diff --git a/llvm/docs/BitCodeFormat.rst b/llvm/docs/BitCodeFormat.rst
index 89531dc..9363a62 100644
--- a/llvm/docs/BitCodeFormat.rst
+++ b/llvm/docs/BitCodeFormat.rst
@@ -658,7 +658,7 @@
MODULE_CODE_GLOBALVAR Record
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-``[GLOBALVAR, pointer type, isconst, initid, linkage, alignment, section, visibility, threadlocal, unnamed_addr]``
+``[GLOBALVAR, pointer type, isconst, initid, linkage, alignment, section, visibility, threadlocal, unnamed_addr, dllstorageclass]``
The ``GLOBALVAR`` record (code 7) marks the declaration or definition of a
global variable. The operand fields are:
@@ -713,12 +713,20 @@
* *unnamed_addr*: If present and non-zero, indicates that the variable has
``unnamed_addr``
+.. _dllstorageclass:
+
+* *dllstorageclass*: If present, an encoding of the DLL storage class of this variable:
+
+ * ``default``: code 0
+ * ``dllimport``: code 1
+ * ``dllexport``: code 2
+
.. _FUNCTION:
MODULE_CODE_FUNCTION Record
^^^^^^^^^^^^^^^^^^^^^^^^^^^
-``[FUNCTION, type, callingconv, isproto, linkage, paramattr, alignment, section, visibility, gc, prefix]``
+``[FUNCTION, type, callingconv, isproto, linkage, paramattr, alignment, section, visibility, gc, prefix, dllstorageclass]``
The ``FUNCTION`` record (code 8) marks the declaration or definition of a
function. The operand fields are:
@@ -762,10 +770,12 @@
* *prefix*: If non-zero, the value index of the prefix data for this function,
plus 1.
+* *dllstorageclass*: An encoding of the `dllstorageclass`_ of this function
+
MODULE_CODE_ALIAS Record
^^^^^^^^^^^^^^^^^^^^^^^^
-``[ALIAS, alias type, aliasee val#, linkage, visibility]``
+``[ALIAS, alias type, aliasee val#, linkage, visibility, dllstorageclass]``
The ``ALIAS`` record (code 9) marks the definition of an alias. The operand
fields are
@@ -778,6 +788,8 @@
* *visibility*: If present, an encoding of the `visibility`_ of the alias
+* *dllstorageclass*: If present, an encoding of the `dllstorageclass`_ of the alias
+
MODULE_CODE_PURGEVALS Record
^^^^^^^^^^^^^^^^^^^^^^^^^^^^